Require OMJulia 0.3.1

[ChrisRackauckas-Claude]

Summary

Ignore this PR until it has been reviewed by @ChrisRackauckas.

• require OMJulia 0.3.1
• avoid the duplicate ModelicaSystem definition in OMJulia 0.3.0

OMJulia 0.3.0 defines the same constructor twice during precompilation. Upstream removed the duplicate in commit 3b97b91; OMJulia 0.3.1 is the first tagged release containing the fix.

Dependencies

The clean base graph also selects precompile-broken IJulia 1.21.0, and its nested Julia 1.10 Testing manifest is independently stale. This one-line compat change is validated in a combined exact-floor stack with the IJulia 1.23.2 floor from #1619 and the manifest repair in #1612; those prerequisites remain separate reviewable changes.

Local validation

• Exact downgrade resolution on Julia 1.10: selected OMJulia 0.3.1.
• Exact-floor build on Julia 1.10: passed.
• using OMJulia at the exact 0.3.1 floor: passed without the 0.3.0 method-overwrite failure.
• Combined exact-floor package test with IJulia 1.23.2 and Regenerate Testing manifest with Julia 1.10 #1612: passed (Explicit Imports 2/2; weave_file 1/1).
• Standalone current-resolution package test on Julia 1.12: Explicit Imports passed 2/2, then the test reproduced the clean-base nested-manifest MbedTLS_jll path failure tracked by Regenerate Testing manifest with Julia 1.10 #1612.
• A fresh current-resolution rerun stacked with IJulia 1.23.2 and Regenerate Testing manifest with Julia 1.10 #1612 reached the same clean-base Julia 1.12 MbedTLS_jll path failure after Explicit Imports passed 2/2; the Julia 1.10 exact-floor stack remains the controlling compat validation.
• Runic.main([\"--check\", \".\"]): passed.
• git diff --check: passed.

[ChrisRackauckas-Claude]

Investigation scratchpad for 7510ebff:

• synchronized against SciML master at 0498ef25; changed only OMJulia = "0.3" to "0.3.1"
• traced OMJulia 0.3.0's duplicate ModelicaSystem definition to upstream fix commit 3b97b91; OMJulia 0.3.1 is the first tagged release containing that fix
• exact Julia 1.10 downgrade resolution selected OMJulia 0.3.1
• exact-floor build and an isolated using OMJulia load passed without the 0.3.0 overwrite
• full exact-floor package test stacked with IJulia 1.23.2 (Require IJulia 1.23.2 #1619) and the independent Testing-manifest repair (Regenerate Testing manifest with Julia 1.10 #1612) passed (Explicit Imports 2/2; weave_file 1/1)
• fresh Julia 1.12 current resolution selected OMJulia 0.3.3; Explicit Imports passed 2/2, after which the suite reproduced the identical clean-base nested Testing-manifest MbedTLS_jll path failure
• Runic --check and git diff --check passed

The current-runtime nested-manifest failure is recorded as clean-base behavior. The successful locked Julia 1.10 combined test is the controlling downgrade validation, while each compat change remains a separate one-line PR.

[ChrisRackauckas-Claude]

CI classification: the spellcheck failure is identical to the clean-base SerPSO diagnostics already reproduced, bisected, and fixed separately in #1614.

This PR changes only the OMJulia compat line; neither reported location is in its diff. The Julia test remains queued/in progress, while the formatting checks are independent. No typo change will be stacked into this focused PR.